Spirax Sarco SDCV44 Split Disc Check Valves Installation And Maintenance Instructions

Brand: Spirax Sarco

Model: SDCV44 Split Disc Check Valves

Type: Installation And Maintenance Instructions

IM-P15 4-11- US Issue 1 1

SDCV44 Split Disc Check Valves

1. Safety Information

2. General Description

3. Installation

4. Commissioning

5. Operation

6. Maintenance

Printed in US

SDCV44

Split Disc Check Valves

Installation and Maintenance Instructions

IM-P15 4-11- US

Issue 1

IM-P15 4-11- US Issue 1

SDCV44 Split Disc Check Valves

Safe operation of these products can only be guaranteed if they are properly installed,

commissioned, used and maintained by qualified personnel in compliance with the operating

instructions. General installation and safety instructions for pipeline and plant construction,

as well as the proper use of tools and safety equip- ment must also be complied with.

1.1 Intended use

Referring to the Installation and Maintenance Instructions, name-plate and Technical

Information Sheet, check that the product is suitable for the intended use/application.

The products listed below comply with the requirements of the European Pressure Equipment

Directive 2014/68/EU and carry the mark when so required.

The products fall within the following Pressure Equipment Directive categories:

Product/Size Group 1

Gases

Group 2

Gases

Group 1

Liquids

Group 2

Liquids

SDCV44 – DN50

Class 150 / 300 N/A Cat I N/A SEP

SDCV44 – DN80

Class 150 / 300 N/A Cat I N/A SEP

SDCV44 – DN100

Class 150 / 300 N/A Cat I N/A SEP

i) The SDCV44 has been specificaly designed for use on Water, Hydrocarbon, and Heat

Transfer Oil. Which is in Group 1 Fluids of the Pressure Equipment Directive. SDCV44

can also be used on Steam or Air. The products use on other fluids may be possible but,

if this is contemplated, Spirax Sarco should be contacted to confirm the suitability of

the product for the application being considered.

ii) Check material suitability, pressure and temperature and their maximum and minimum

values. If the maximum operating limits of the product are lower than those of the system

in which it is being fitted, or if malfunction of the product could result in a dangerous

overpressure or overtem- perature occurrence, ensure a safety device is included in the

system to prevent such over-limit situations.

iii) Determine the correct installation situation and direction of fluid flow.

iv) Spirax Sarco products are not intended to withstand external stresses that may be

induced by any system to which they are fitted. It is the responsibility of the installer to

consider these stresses and take adequate precautions to minimise them.

v) Remove protection covers from all connections before installation.

1.2 Access

Ensure safe access and if necessary a safe working platform (suitably guarded) before

attempting to work on the product. Arrange suitable lifting gear if required.

1.3 Lighting

Ensure adequate lighting, particularly where detailed or intricate work is required.

1. Safety information

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SDCV44 Split Disc Check Valves

1.4 Hazardous liquids or gases in the pipeline

Consider what is in the pipeline or what may have been in the pipeline at some previous time.

Consider: flammable materials, substances hazard- ous to health, extremes of temperature.

1.5 Hazardous environment around the product

Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases, extremes

of temperature, hot surfaces, fire hazard (e.g. during welding), excessive noise, moving

machinery.

1.6 The system

Consider the effect on the complete system of the work proposed. Will any proposed action

(e.g. closing isolation valves, electrical isolation) put any other part of the system or any

personnel at risk?

Dangers might include isolation of vents or protective devices or the rendering ineffective

of controls or alarms. Ensure isolation valves are turned on and off in a gradual way to avoid

system shocks.

1.7 Pressure systems

Ensure that any pressure is isolated and safely vented to atmospheric pressure. Consider

double isolation (double block and bleed) and the lock- ing or labelling of closed valves. Do

not assume that the system has depressurised even when the pressure gauge indicates zero.

1.8 Temperature

Allow time for temperature to normalise after isolation to avoid danger of burns.

1.9 Tools and consumables

Before starting work ensure that you have suitable tools and/or consumables available. Use

only genuine Spirax Sarco replacement parts.

1.10 Protective clothing

Consider whether you and/or others in the vicinity require any protective clothing to protect

against the hazards of, for example, chemicals, high/ low temperature, radiation, noise,

falling objects, and dangers to eyes and face.

1.11 Permits to work

All work must be carried out or be supervised by a suitably competent person. Installation

and operating personnel should be trained in the correct use of the product according to

the Installation and Maintenance Instructions. Where a formal ‘permit to work’ system is in

force it must be complied with. Where there is no such system, it is recommended that a

responsible person should know what work is going on and, where necessary, arrange to

have an assistant whose primary responsibility is safety. Post ‘warning notices’ if necessary.

1.12 Handling

Manual handling of large and/or heavy products may present a risk of injury. Lifting, pushing,

pulling, carrying or supporting a load by bodily force can cause injury particularly to the

back. You are advised to assess the risks taking into account the task, the individual, the

load and the working environment and use the appropriate handling method depending on

the circumstances of the work being done.

IM-P15 4-11- US Issue 1

SDCV44 Split Disc Check Valves

1.13 Residual hazards

In normal use the external surface of the product may be very hot. If used at the maximum

permitted operating conditions the surface temperature of some products may reach

temperatures of 572°F (300°C). Many products are not self-draining. Take due care when

dismantling or removing the product from an installation (refer to ‘Maintenance instructions’).

1.14 Freezing

Provision must be made to protect products which are not self-draining against frost damage

in environments where they may be exposed to tem- peratures below freezing point.

1.15 Safety information - Product specific

See the relevant Section in the attached Installation and Maintenance Instructions for specific

details relating to this product.

1.16 Disposal

Unless otherwise stated in the Installation and Maintenance Instructions, this product is

recyclable and no ecological hazard is anticipated with its disposal providing due care is

taken.

1.17 Returning products

Customers and stockists are reminded that under Health, Safety and Environment Law, when

returning products to Spirax Sarco they must provide information on any hazards and the

precautions to be taken due to contamination residues or mechanical damage which may

present a health, safety or environmental risk. This information must be provided in writing

including Health and Safety data sheets relating to any substances identified as hazardous

or potentially hazardous.

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SDCV44 Split Disc Check Valves

2.1 Description

SDCV44 split disc check valves are of a wafer pattern, designed to be sandwiched between ANSI

150 or 300 flanges.

Their function is to prevent reverse flow on a wide variety of fluids.

The SDCV44 is designed for use with agressive fluids, vapours, acids and alkalines at high pressures

and temperatures.

The face-to-face dimension of the SDCV44 conforms to API 594. As standard the valves have a

metal-to-metal seat.

Note: For additional information see the following Technical Information Sheet: TI-P154-10-US.

2. General description

Fig. 1 SDCV disc check valve shown sandwiched between flanged connections

IM-P15 4-11- US Issue 1

SDCV44 Split Disc Check Valves

The product must not be used in this region.

A - BANSI 150 flanges

A - CANSI 300 flanges

Maximum body design condition

PMA Maximum allowable pressure 720 psi g (49.6 bar g)

TMA Maximum allowable temperature 650 °F (343.3 °C)

PMO Maximum operating pressure 720 psi g (49.6 bar g)

TMO Maximum metal seat operating temperature 650 °F (343.5 °C)

Minimum operating metal seat temperature -20 °F (-28.88 °C)

Designed for a maximum cold hydraulic test pressure 1475 psi g (101.7 bar g)

Note: Limited to flange rating

Temperature °F

Temperature °C

Pressure psi g

Pressure/temperature limits

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SDCV44 Split Disc Check Valves

Note: Before actioning any installation observe the ‘Safety information’ in Section 2.

Referring to the Installation and Maintenance Instructions, name-plate and Technical Information

Sheet, check that the product is suitable for the intended installation:

3.1 Check materials, pressure and temperature

and their maximum values. If the maximum

operating limit of the product is lower than that

of the system in which it is being fitted, ensure

that a safety device is included in the system to

prevent overpressurisation.

3.2 Determine the correct installation situation and

the direction of fluid flow.

3.3 Remove protective covers from all connections.

3.4 Before installing the SDCV remove the corrosion

inhibitor from the flange faces and clean the

machined faces on the disc and body seats using

paraffin or a similar liquid. This will remove the

last traces of protective coating.

3.5 Split disc check valves simply fit between two

pipe flanges (see Fig. 1). Standard gaskets are

used either side of the valve together with longer

bolts or studs.

Note: flanges, bolts (or studs), nuts and joint

gaskets are to be provided by the installer.

Normal sensible flange practice should be

followed e.g. torque tightening the bolts in

opposite sequence. Install the SDCV44 in the

pipeline checking that it has been fitted with the

flow in the direction of the arrow on the valve

body. If the valve is in a horizontal pipeline the

hinge pin must be in the vertical position for

correct operation. Split disc check valves can be

installed with the liquid/gas flowing horizontally

into the valve (Fig. 2 valve shown in the open

position), or with the liquid/gas flowing vertically

upwards through the valve (Fig. 3 valve shown in

the closed position). Split disc check valves are

not recommended for installation with the liquid/

gas flowing vertically down through the valve.

3.6 Split disc check valves are not suitable for use

where heavily pulsating flow exists, such as

close to a compressor.

3.7 Ensure suitable slinging/lifting/support

equipment and procedures are used relevant to

the valve size and weight.

3. Installation

Open Closed

Flow Flow

Open Closed

Flow Flow

Open

Flow

Closed

Flow

Fig. 2

Fig. 3

IM-P15 4-11- US Issue 1

SDCV44 Split Disc Check Valves

Before actioning any maintenance program observe the ‘Safety information’ in Section 2.

6.1 Before undertaking any maintenance on the valve it must be isolated from both the supply

line and return line and any pressure allowed to safely normalize to atmosphere. The valve

should then be allowed to cool. When reassembling, ensure that all joint faces are clean.

6.2 Remove the valve from the pipeline by loosening all flange nuts and removing sufficient

bolts or studs to allow the valve to be withdrawn from between the flanges. Note: Ensure

suitable slinging/lifting/support equipment and safety procedures are used relevant to the

valve size and weight.

6.3 Clean the valve removing any agressive media. Valves should be checked every 6 months.

6. Maintenance

After installation or maintenance ensure that the system is fully functional. Carry out tests on any

alarms or protective devices.

4. Commissioning

Disc check valves are opened by the pressure of the fluid and closed by the spring as soon as the

flow ceases and before the reverse flow occurs.

5. Operation

Spirax Sarco Applications Engineering Department

Toll Free at: 1-800-883-4411

SPIRAX SARCO, INC.

1150 NORTHPOINT BLVD.

BLYTHEWOOD, SC 29016

PHONE 803-714-2000

FAX 803-714-2222

www.spiraxsarco.com/global/us

Spirax Sarco SDCV44 Split Disc Check Valves Installation And Maintenance Instructions

Spirax Sarco SDCV44 Split Disc Check Valves Installation And Maintenance Instructions

Spirax Sarco SDCV44 Split Disc Check Valves Installation And Maintenance Instructions

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